Trilite Pocket Trilene Vaporizer
Developed by a London anaesthetic registrar, Dr John Haywood-Butt, whilst in the Royal Navy during the Second World War. It was for self-administration of trilene analgesia for war casualties, and was therefore small, robust, easy to use, non-spillable and easily refilled. It was not produced until 1947, but had some success in obstetrics, minor surgery, trigeminal neuralgia etc. At room temperature 0.3 to 0.4% trilene vapour is produced.

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